Shoe mounting for brake assemblies



API'll 18 1950 c. l.. EKSERGIAN 2,504,668

SHOE MOUNTING FOR` BRAKE ASSEMBLIES Filed Feb. 22, 1945 L'aroZuSL. Esergan INVENTOR Patented Apr. 18, 1950 UNITED STATES PATENT OFFICE The Budd Company, Philadelphia, Pa., a corporation of Pennsylvania Application February 22, 1945, Serial No. 579,175

4 Claims.

The invention relates to brake mechanism and particularly to such'a mechanism in which the wear surfaces or shoes proper are readily mounted or demounted and securely held in place when mounted.

The invention is more particularly concerned with the disc-type of brake in which the shoes engage the opposite sides of a rotary disc-like member to eifect the braking.

It is an object of the invention to make the shoe assembly of such brakes of a simplified form, to facilitate the manufacture thereof and in which the shoes proper are readily positioned or removed from the brake head carrying them by simple relative endwise movement.

To this end the brake heads and the shoes proper are constructed as separate sub-assemblies and are provided with interengaging positioning means which securely hold them in their is in turn carried by the wheel and axle assembly 2 and the truck frame I in a manner similar to that disclosed and claimed in copending application, Serial No. 399,779, for Brake mechanism. filed June 26, 1941, now Patent No. 2,413,614, issued December 31, 1946. The levers 8,8 are actuated by a cylinder actuator 9 similar to the cylinder actuator of the referred to copending application.

Since the invention is not concerned with the general 'arrangement of the brake mechanism, the above brief description is believed to suice to indicate the manner in which the invention fits into such arrangement.

proper relation, and including quick detachablefo means for readily disconnecting them and thereby permitting the shoes to be moved endwise of the mounting heads for disassembly or replacement.

Other and further objects and advantages and the means through which they are attained will become apparent from the following detailed description when read in connection with the draw ings forming a part thereof. Y

In the drawings:

Fig. l is a plan view of one-quarter of a railway truck showing a brake mechanism to which the invention has been applied;

Fig. 2 is a 'fragmentary side elevational view of the interengaging brake elements of the invention;

Fig. 3 is an edge view of the brake shoe assembly and connected parts, parts being shown in section; and,

Fig. 4 is a fragmentary sectional view taken substantially along the line 4-4 of Fig. 2, showing the parts during assembly, but before the shoe proper is rmly secured in place.

The invention has been shown applied to the brake mechanism of a railway truck in which 'a Ilio Each brake shoe assembly, according to the invention, comprises a brake head, as I0, of arcuate segmental form which has pivotally secured to the outer face thereof as by pivot pin II, the associated brake lever 6. The opposite or inner face of the brake head I0 is machined at to provide a plane surface, and in this preferred form, has no projections beyond. said fiat face, designated .by I2. At its upper end the brake head is formed with a projecting locating and securing pin, as I3, which pin, as shown, may be a headed pin driven through a hole aligned with the upper bearing recess I4 for the lever pivot pin II.

The upper end of the shoe beyond which the pin I3 extends is formed with a ilat face I5 widened in the plane of the head and arrangedl at right angles to the face I2 and, on the side opposite the nat face I2 said face I5 is formed withl additional locating means in the form of an inclined face I6.

The brake `shoe -proper to be assembled with said head may k comprise a sheet metal backing plate having two angularly related portions Il and I8. The portion Il carries on the inner face thereof a suitable friction material, such as, composition brake lining I9 which is secured, as by countersunk rivets,l to the backing plate portion I1. The angularly related portion I8 is provided with a transversely extending slot 20 which receives the locating and securing pin I3 and at its free edge itis formed on opposite sides of the pin ywith inclined portions 2I, 2|, see Fig. 2, which are adapted to cooperate with the inclined face I6 on the head I0.

lfvreferably, the angle between the portions Il and I8 before nal assembly is somewhat less than a right angle, as shown in Fig. 4. In the assembly, the shoe is' flrst inserted over the locating pin I3, as shown in Fig. 4, with the lower edge of the backing plate portion Il resting against the flat face I2 of the head and the margigs of the inclined portions 2I, 2i engaging the upper portion of the inclined face Il, as shownv in Fig. 4. 'I'he shoe is then forced downwardly by quick detachable means for securing it in place.

Such means may comprise a key 22 having its entering end tapered on its upper face and fitting a slot 23 in the pin I3. .A cup-shaped washer 24 is preferably located between the key and the portion 'I3 of the shoe, and a coil spring 25 has its ends engage the bottom of the cup and the portion I8, respectively. The key is provided with a cut out portionY 26 in its lower face into which the spring snaps the top of the cup washer 24 when the key is in place, as shown ln Figs. 2 and 3, to hold the key in locking position.

As the key is driven home, it forces the washer and spring downwardly, compressing the spring, and through the pressure so produced, forcing the inclined portions 2I, 2| of the backing plate of the shoe downwardly over the inclined face I6. This has the effect of drawing the upper portion of theA backing plate laterally so that the outer face of the portion I1 thereof is drawn into contact with the flat face I2 of the head, and the angle between the parts I1 and Il is opened slightly in this operation, the resiliency of the parts exerting a spring action to hold the portion I1 and face I 2 in ilrm contact.

The engagement of the pin I3 with the sides of the slot and the interengagement of the in-A clined portions 2I, 2l on the opposite sides of the pin I3, with the inclined face Il, see Fig. 2, provide a strong positioning action in addition to the frictional engagement between portion I'l and nat face I2, to hold thelower end of the shoe from swinging in its own plane, thereby securely locking the shoe and head in operative relation.

It will be understood that when braking force is applied forcing the shoes against the disc. the friction between the large contacting flat metal faces I2 and Il is additional insurance against relative shifting of the shoes and heads. With the arrangements shown, the shoes can readily be disassembled by knocking out the key 22, removing the cup washer 24 and spring 25, and then lifting the shoe upwardly off the locating and securing pin I3. 'I'he parts can be as readily assembled by proceeding in reverse order.

In the form of the invention shown, means may be associated with the lower ends of the brake heads III for holding the shoes on opposite sides of the disc in parallel relation. Such means is entirely similar to the means shown in copending application, Serial No. 529,730 for Brake mechanism, filed April 6, 1944, now Patent No. 2,402,386, issuedJune 18, 1946, and need not be described herein.

While the invention has been herein described in detail in a preferred form, it will be understood that changes and modifications may be made by those skilled in this art without departing from the main features of the invention, and such changes and modifications are intended to be covered by the appended claims. 1

What is claimed is:

1. A brake assembly comprising a head having a flat face on one side thereof and an end face having an inclined locating shoulder formed on the side thereof opposite said flat face, a locating and securing pin projecting from said end face, a removable brake shoe comprising a portion adapted to seat against said ilat face and a portion normally extending therefrom at an l. 4 angle slightly less than 90 and across the end face of the head, said last-named portion having a transverse slot receiving said pin and terminating in an inclined portion engaging said inclined locating shoulder, and quick detachable means associated with said pin for forcing said shoe endwise thereby securely locating it on the head throughA the interengaging inclined portions on the head and shoe respectively and bringing the iirst-named portion thereof into full seating engagement with the flat face of the head.

2. A brake assembly comprising a head having a fiat face on one side thereof and an end face having a locating shoulder on the side thereof opposite said flat face, a locating and securing pin projecting from said end face intermediate said flat face and said locating shoulder, a removable brake shoe comprising a metal backing plate having a portion seated against said ilat face and a portion extending across the end face and having locating engagement with said pin and said shoulder, and quick detachable means cooperating with -said pin for securing said shoe on the head.

3. A brake assembly comprising a head having a flat face on one side thereof and an end face formed on the side opposite said flat face with an inclined locating shoulder widened in the plane of said head, a locating and securing pin projecting said shoe endwise thereby securely locating it through the interengaging inclined portions on the shoe and head, respectively, and bringing the first-named portion thereof into full seating engagement with the at face of the head.

4. A brake assembly comprising a head having a planar face on one side thereof and having locating means, including an end locating face at an angle to said planar face and a pin projecting from said end locating face lengthwise of the head. all said locating means being adjacent one end of the head and forming the sole means for locating a shoe on the head, a removable brake shoe comprising a metal backing plate having a portion seated against said planar face and a portion engaging said locating means to position the shoe on the head, and mick-detachable means for securing said shoe on the head but permitting its straight endwise removal therefrom upon the release of said quick-detachable means.

CAROLUS L. EKSERGIAN.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 658,856 Mitchell Oct. 2, 1900 931,093 Simpson Aug. 17, 1909 1,561,703 Down Nov. 17, 1925 1,912,684 Blume June 6, 1933 2,027,823 Hoffman Jan. 14, 1936 

